Benzimidazolinone compounds

ABSTRACT

BENZIMIDAZOLINONE COMPOUNDS WHICH EXHIBIT ANTIINFLAMMATORY ACTIVITY HAVE THE FOLLOWING FORMULA   1-(-C&lt;(=N-Z-S-)(-R1)),3-R2,(R3)N-BENZIMIDAZOLIN-2-ONE   WHEREIN Z IS ETHYLENE OR PROPYLENE; R1 IS HYDROGEN, METHYL, ETHYL, PHENYL, NITROPHENYL, BENZYL, PHENETHYL, TOLYL OR XYLYL; R2 IS HYDROGEN; ALKYL OF FROM 1 TO 5 CARBONS; BENZYL; NITROBENZYL PHENETHYL; NITROPHENETHYL;   -C&lt;(=N-Z-S-)(-R1)   WHEREIN Z AND R1 ARE AS DEFINED ABOVE; ALKOXYCARBONYL WHEREIN THE ALKOXY RADICAL IS FROM 1 TO 10 CARBON ATOMS; PHENOXYCARBONYL; OR SUBSTITUTED PHENOXYCARBONYL WHEREIN THE SUBSTITUENT IS NITRO, HALO OR ALKYL OF FROM 1 TO 5 CARBONS; ACYL OF FROM 2 TO 6 CARBON ATOMS; BENZOYL OR SUBSTITUTED BENZOYL WHEREIN THE SUBSTITUENT IS HALOGEN OR ALKYL OF FROM 1 TO 3 CARBONS; SYMMETRICALLY DIALKYL-SUBSTITUTED CARBAMOYL-ALKYLENE WHEREIN THE DIAKYL RADIBONS; AND DIALKYLAMINO-ALKYLENE WHEREIN THE DIALKYL RADICALS HAVE FROM 1 TO 3 CARBONS AND THE ALKYLENE RADICAL HAS 2 OR 3 CARBONS; R3 IS HYDROGEN, HALOGEN, NITRO, CYANO, TRIFLUOROMETHYL, ALKYL OF FROM 1 TO 3 CARBON ATOMS, ALKOXY OF FROM 1 TO 3 CARBON ATOMS, AMINO, DIALKYLAMINO WHEREIN THE ALKYL RADICAL HAS FROM 1 TO 3 CARBON ATOMS, ALKANOYL OF FROM 2 TO 6 CARBONS, ALKYLAMIDO OF FROM 2 TO 6 CARBONS, OR BENZOYL; AND N IS 0, 1 OR 2.

United States Patent Int. (:1. cine 93/06 U.S. Cl. 260-243 R 3 Claims ABSTRACT OF THE DISCLOSURE Benzimidazolinone compounds which exhibit antiinfiammatory activity have the following formula Na A.

wherein Z is ethylene or propylene;

R is hydrogen, methyl, ethyl, phenyl, nitrophenyl, benzyl, phenethyl, tolyl or xylyl;

R is hydrogen; alkyl of from 1 to 5 carbons; benzyl; nitrobenzyl; phenethyl; nitrophenethyl;

wherein Z and R are as defined above; alkoxycarbonyl wherein the alkoxy radical is from 1 to carbon atoms; phenoxycarbonyl; or substituted phenoxycarbonyl wherein the substituent is nitro, halo or alkyl of from 1 to 5 carbons; acyl of from 2 to 6 carbon atoms; benzoyl or substituted benzoyl wherein the substituent is halogen or alkyl of from 1 to 3 carbons; symmetrically dialkyl-substituted carbamoyl wherein the alkyl radical has from 1 to 3 carbons; and dialkylamino-alkylene wherein the dialkyl radicals have from 1 to 3 carbons and the alkylene radical has 2 or 3 carbons;

R is hydrogen, halogen, nitro, cyano, trifiuoromethyl, alkyl of from 1 to 3 carbon atoms, alkoxy of from 1 to 3 carbon atoms, amino, dialkylamino 'wherein the alkyl radical has from 1 to 3 carbon atoms, alkanoyl of from 2 to 6 carbons, alkylamido of from 2 to 6 carbons, or benzoyl; and

n is 0, 1 or 2.

RELATED APPLICATIONS This application is a division of Ser. No. 276,507 filed July 31, 1972.

OBJECTS OF THE INVENTION It is an object of the present invention to provide new compounds having antiinfiammatory activity. Another object is to provide a method for the preparation of these compounds. Still another object is to provide pharmaceutical compositions for the administration of these compounds. These and other objects of the present invention will be apparent from the following description.

3,833,574 Patented Sept. 3, 1974 DETAILED DESCRIPTION Compounds of structure I can be prepared by first converting the benzimidazolone (II) wherein R is other than LZJ l.

into the salt (III). Metal hydrides such as sodium hydride, metal amides such as sodium amide or potassium amide, or alkali metal alkoxides such as sodium methoxide, potassium ethoxide or sodium butoxide, may be used to form the salt:

NR1 e NR (a J (R J a Ne 11 III Interaction of the salt III with the haloalkyl isothiocyanate IV gives the compound of formula I wherein R is H. The foregoing reactions can be brought about in a variety of non-protic solvents such as aromatic hydrocarbons, e.g., benzene, toluene or xylene, or ethers, e.g., ethyl ether or ethylene glycol dimethyl ether, at temperatures ranging from about 0 to about for periods of from about one hour to about twenty-four hours. A slight excess of the employed base is advantageous; thus the molar ratio of benzimidazolone (II) to base may range from about 1:1 to about 1:2.

Compounds of formula I wherein R is may be prepared by reacting a compound of formula H wherein R is H with at least two equivalents each of haloisothiocyanate and NaH. Compounds of formula I wherein R is may also be prepared starting from a compound of formula I wherein R is H by reacting this compound of formula I with haloalkyl isothiocyanate and NaH. The reaction time can range from one to about twenty-four hours at temperatures of from about 25 to about 150. The synthesis of benzimidazolones of formula II is well documented in the following publications.

(a) The Chemistry of the Benzimidazoles, J. B. Wright,

Chem. Rev., 1951, 48, 397.

(d) Benzimidazoles, Chemistry of Carbon Com- Pozharskii, A. D. Garnovskii, and .A. M. Simonov, Russ. Chem. Rev., 1966, 35, 122.

(c) Imidazoles and Condensed Imidazoles, Heterocyclic Compounds, ed. R. C. Elderfield, Vol. 5, p. =194. (d) Benzimidazoles, Chemistry of Carbon Compounds, ed. E. H. Rodd, Vol. IV A, p. 321 )1957).

The haloalkyl isothiocyanates of formula IV can be readily prepared from their haloalkylamines V and thiophosgene:

X NH) X NC S j C S C12 \z/ it is V IV Additional routes toward isothiocyanates are described in Houben-Weyls M ethoden Der Organischen Chemie, Vol. 9, G. Thieme Verlag, Stuttgart (1955 Examples of aliphatic haloalkyl isothiocyanates which can be employed herein include the following:

SCNOH;-CH1-Br SON-GHz-CHz-CHa-Ol SON-CHz-CH-Br S CN-CHz-CH-Cl Typical compounds included in the present invention are the following:

v A @ll-Sm 1 (CH3) 2N (CH1) aNH The compounds of formula I form physiologically acceptable acid-addition salts with inorganic and organic acids. These acid-addition salts frequently provide useful means for isolating the products from reaction mixtures by forming the salt in a medium in which it is insoluble. The free base may then be obtained by neutralization, e.g., with a base such as sodium hydroxide. Then any other salt may againbe formed from the free base and the appropriate inorganic acid. Illustrative are the hydrohalides, especially the hydrochloride and hydrobromide which are preferred, sulfate, nitrate, phosphate, tartrate, maleate, fumarate, citrate, succinate, methanesulfonate, benzenesulfonate, toluenesulfonate, and the like.

The compounds of this invention are useful as anti-in-,

zone or indomethacin. They may be used to decrease joint swelling tenderness, pain and stiffness in mammalian species, e.g., in conditions such as rheumatoid arthritis. The compounds of this invention or a physiologically acceptable acid-addition salt thereof may be compounded according to accepted pharmaceutical practice for administration orally or by injection. Suitable oral dosage forms are tablets, capsules, elixirs, suppositories, or powders, while solutions or suspensions are suitable for injection. The quantity administered may be from about 25 mg. to about 2 gm. per day, and preferably from about 50 mg. to about 200 mg. per day.

The present invention consists the following formula t of compounds having wherein Y Z is ethylene or propylene.

R is hydrogen, methyl, ethyl, phenyl, nitrophenyl, benzyl, phenethyl, tolyl, or xylyl.

R ishydr gen; alkyl of from 1 to 5 carbons, e.g.,

methyl, ethyl, n-p'ropyl, i-propyl, n-butyl, i-butyl, t-butyl, n-pentyl, Z-methyl-n-butyI, or neopentyl; benzyl; nitrobenzyl; phenethyl; nitrophenethyl;

wherein Z and R are as defined above; alkoxycarbonyl wherein the alkoxy radical is from 1 to carbon atoms, e.g., methoxy, alkoxy, propoxy, isopropoxy, butoxy, isobutoxy, t-butoxy, pentyloxy, hexyloxy, heptyloxy, octyloxy, nonyloxy, or decyloxy; phenoxycarbonyl; or substi ethyl, propyl, or i-propyl; symmetrically dialkyl-substitu ted carbamoyl wherein the alkyl radical has from 1 to 3 carbons, e.gl', methyl, ethyl, n-propyl, or i-propyl; and dialkylaminoalkylene wherein the dialkyl radicals have from 1 to 3 carbons, e.g., methyl, ethyl, n-propyl or i-propyl;

alkanoyl of from 2 to 6 carbons, e.g., acetyl, propionyl, n-butyroyl, nsv'aleroyl, trimethylacetyl, or hexanoyl; alkylamido of from 2 to 6 carbons, e.g., wherein the alkyl radical maybe methyl, ethyl, n-propyl, i-propyl, n-butyl,

i-butyl, t-:butyl, n-pentyl,-2-methyl-n-butyl, or neopentyl;

or benzoylr n is 0, 1 or 2.

Thefollowing examples illustrate the present invention without;howeverylimitin the same thereto. All temp mes are fixer-589w in grees Celsius.

EXAMPLE 1 1- (2-Thiazolin-2-yl) -2-benzimidazolinone To a slurry of 5.0 g. of benzimidazolone in 250 ml. dry ethylene glycol dimethyl ether there is added 1.2 g. of sodium hydride and the mixture is stirred for two hours. There is then added 4.2 g. of 2-ch1oroethyl isothiocyanate in 5 ml. of dry ethylene glycol dimethyl ether and the mixture is refluxed for two hours. The solvent is removed in vacuo and water is added to the residue. The resulting solid is filtered off, dried and slurried in ml. of chloroform. After sitting overnight the yellow solution is filtered off and the white residue is crystallized from CHCl to yield 1.9 g. mp. 211-212".

EXAMPLE 2 1,3-bis 2-Thiazolin-2-y1) -2-benzimidazolinone To a slurry of 4.0 g. of benzimidazolone in 250 ml. of dry ethylene glycol dimethyl ether there is added 2.0 g. of sodium hydride and the mixture is stirred at room temperature for two hours. Then there is added 7.2 g. of 2- chloroethyl isothiocyanate in 10 ml. of dry ethylene glycol dimethyl ether and the mixture is refluxed for two hours. The solvent is removed in vacuo and water is added to the residue. The resulting solid is filtered off and crystallized from ethylene glycol dimethyl ether to yield 2.7 g., m.p. 228-230.

EXAMPLE 3 5 and 6-Chloro-1-(2-thiaz0lin-2-yl)-2-benzimidazolinone To a solution of 5.0 g. of S-chlorobenzimidazolone in 250 ml. dry ethylene glycol dimethyl ether there is added 1.3 g. of sodium hydride. The solution is stirred at room temperature for two hours and then 4.3 g. of 3-chloroethyl isothiocyanate in 5 ml. of dry ethylene glycol dimethyl ether is added. The mixture is refluxed for two hours and the solvent is removed in vaczm. Water is added to the residue. The resulting solid is filtered 01f, dried and crystallized from CHCI to yield 3.0 g. of the isomeric mixture, m.p. 220-228.

EXAMPLE 4 5- and 6-Chloro-1- [2-(dimethylamino)-ethyl]-3-(2- thiazolin-Z-yl)-2-benzimidazolinone To a solution of 5.2 g. of 5- and 6-chloro-1-(2-thiazolin-Z-yl)-2-benzamidazolinone in 250 ml. of dry ethylene glycol dimethyl ether there is added 0.6 g. of sodium hydride and the mixture is stirred at room temperature for one hour. There is then added a solution of 2.2 g. of N,N-

'dimethylamino-2-chloroethane in 50 ml. of toluene and the mixture is refluxed for five hours. An additional 0.3 g. of sodium hydride is added and the mixture is stirred for 0.5 hour. N,N Dimethylamino-Z-chloroethane (1.1 g.) in 25 ml. of toluene is added and the mixture is refluxed overnight. The solvent is removed in vacuo and water is added to the residue. The resulting oil is extracted with CHCl dried over MgSO and the CHCI removed in vacuo. The oily residue is chromatographed on an Alumina Act IV column; elution with 1:1 petroleum etherether yields 1.0 g., m.p. 112 C.

EXAMPLE 5 1-(2-Thiazolin-2-yl)-3-benzyl-benzimidazolinone To 0.25 g. of the product of Example 1 (0.001 mole) in 25 ml. of dry ethylene glycol dimethyl ether there is added 0.03 g. of NaH and the mixture is stirred at room temperature for one hour. There is then added a solution of 0.17 g. (0.001 mole) of benzyl bromide in 5 ml. of

' toluene and the mixture is refluxed for 5 hours. An additional 0.015 g. of NaH is added and the mixture stirred for 0.5 hour. Benzyl bromide 0.09 g. (0.0005 mole) in 2.5

ml. of toluene is added and the mixture refluxed overnight. The solvent is removed in vacuo and water is added to the residue. The resulting oil is extracted with CHC1 dried over MgSO and the CHCI removed in vacuo. The oily residue is chromtographed on an alumina ActIV EXAMPLES, 6-44 Repeating th e procedure ofiEka mple Shut substituting respectively for benzyl bromide the compounds listed belowin Column I, there is obtained respectivelythe com column and eluted with '1 :1 petroleum ether-ether to yield 5 pound of the following formula wherein R is the rudieal the title compound. listed in Column II:

ion

1 (CHahCHCILBr CHz=CHCH2Br TABLE-Continued t it new Example 27-..'...:......'-:.-. CHaG OB! EXAMPLES -56 6- or 7-p0sitions are listed in Column 1, and wherein the R substituent in the 3-position is listed in Column 2,

Repeating the procedure of Example 1 but substituting there is obtained respectively the correspondingly R and/ for benzimidazolone the substituted benzimidazolone of or k -substituted 1 (Z-thiazolin-Z-yl) 2 benzimidazoformula I wherein the R substituent(s) in the 4-, 5-, linone:

Example 52 .1 CH3 -om a -om-on=on Y s4 H I l v 55 CN 3 What is claimed is: 1. A method of preparing a compound of the formula '-NH. ,1:

an Q 11W? i. I i

0 N with at least 2 equivalents each of NaH and Ia haloalltyl I isothiocyanate of the formula V X Z-- -NG kz) wherein Z and R are as defined in Claim-1 and X is wherein "C1 or Br. V Y Zis ethylene or Propylene; i a??? of pmparmg a qm of Clalm 1 R is hydrogen, methyl, ethyl, phenyl, nitrophenyl, benzyl, I

phenethyl, tolyl or xylyl; R is hydrogen; t N R is hydrogen, halogen, nitro, cyano, trifluoromethyl, 0 K J alkyl of'frorn 1 to 3 carbon atoms, alkoxy of from H H 1 to 3 carbon atoms, amino, dialkylamino wherein the I I I I alkyl radical has from 1 to 3 carbon atoms, alkanoyl which comprises reacting a compound of the formula of from 2 to 6 carbons, alkylamido of from 2 to 6 carbons, or benzoyl; and n is O, 1 or 2 which comprises interacting a salt of the formula NH S r, V with NaH and a haloalkyl isothiocyanate of the formula with a haloalkyl isothiocyanate of the formula I,

X--'ZNCS I Y x-zNcs wherein Z and R are as defined in Claim 1 and X is wherein R n, Z and R are as defined in Claim 1 and C1 or Br;

X is C1 or Br. References Cited. 2. A method of preparing a compound of Claim 1 UNITED STATES PATENTS wherein R is v Y 3,7 ',55, 316. 8/1973 Narayananet al. 260243 A 3,759,903 9/1913 Haugwitzet a1. 260-243 J JOHN-M. EORD, Primary Examiner I I I in.

which comprises reacting a compound of the formula 424-246,.270; 2160- 506,? I

F0405) i UNITED STATES PATENT'OFFICE Y CERTIFICATE OF CORRECTION Patent No. 3 s33,574. Dated September 3-, 1974 e lhventofls) Rudiger- D. l-Iaugwitz et al. C C

It is certified that error appears in the above-identified patent Y i and that said Letters Patent are hereby corrected as shown below:

Column 2, delete line 65 and insert-00) "Advances in the Chemistry of Imidazoles" A.F.-.

Column 6; line 66-, after "benzyl insert -2 Signed and sealed this "day of November V1974.-

(S AL)- Attest: I

McCOY M. GIBSON JR. C. I IARSH'ALL DANN v Attesting Officer Commissioner of Patents 

